But people who are against UBI by default seem to want some kind of "policing" before they'll consider it.
Various countries have various things that operate on similar principles, such as transit cards etc.
Hell, even VIDEO GAMES have done this: Special "premium" currencies that you can use only for certain things, buy with realmoney or earn through various activities, and cannot trade.
> Issue special debit cards for UBI
> Issue special machines/payment processors for those cards to registered merchants, landlords, and utility and healthcare providers.